/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.log4j.varia;

import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.spi.LoggingEvent;

/**
 * A NullAppender merely exists, it never outputs a message to any device.
 * 
 * @author Ceki G&uuml;lc&uml;
 */
public class NullAppender extends AppenderSkeleton {

	private static NullAppender instance = new NullAppender();

	public NullAppender() {
	}

	/**
	 * There are no options to acticate.
	 * */
	public void activateOptions() {
	}

	/**
	 * Whenever you can, use this method to retreive an instance instead of
	 * instantiating a new one with <code>new</code>.
	 * */
	public NullAppender getInstance() {
		return instance;
	}

	public void close() {
	}

	/**
	 * Does not do anything.
	 * */
	public void doAppend(LoggingEvent event) {
	}

	/**
	 * Does not do anything.
	 * */
	protected void append(LoggingEvent event) {
	}

	/**
	 * NullAppenders do not need a layout.
	 * */
	public boolean requiresLayout() {
		return false;
	}
}
